I was wondering if that was the case! The sonic quality feels different than the stuff he put out publicly prior to the 2013 OSB, like on Music-4-Movement, but who knows...

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Former concert pianist and professional musician here. This waltz is VERY different structurally and harmonically from all of Brent's original stuff that I've heard; which leads me to think it isn't his music.

I'm kind of at the point where I'll just transcribe it from ear and re record this gem for all to use. I just wish I knew who to credit!